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有个读学前班的小孩问我地球的形状像什么,我告诉他地球是球形的,就像他玩的篮球一样。几天之后,小孩疑惑地对我说,别人告诉他地球像梨子。在他看来,球和梨的外形很不一样,地球到底像哪一个呢?很多科普读物,教科书甚至专业书刊也说地球像梨。如《地学概论》98页“……可见大地水准面是北极略为鼓出,南极略为凹进的一个不规则椭球体。因此地球的真实形状好像个”梨“……。《中国大百科全书·天文学》”地球“条目……地球不是正球体,而是扁球体,或者说,更像个梨状的旋转体。……”让我们来看看地球的实际情况。地球半径赤道处a 为6378.140千米,极处 b 为6356.755千米,平均半
A reading preschool boy asked me what the shape of the earth is like. I told him that the earth is spherical, just like the basketball he plays. A few days later, the child said to me in doubt, others told him that the earth is like a pear. In his opinion, the shape of the ball and pear is very different, which one in the world? Many popular books, textbooks and even professional books also said the earth like pear. As can be seen from “An Introduction to Geosciences” on page 98, “... the geoid is an irregular ellipsoid slightly arched in the Arctic and a slightly concave in the Antarctic, so the true shape of the earth looks like a pear” .... “ Encyclopedia · Astronomy ”“ Earth ”entry ... The earth is not a true sphere, but rather a flat sphere, or rather a pear-shaped body of revolution .... " Let’s take a look at the real situation on earth. The radius of the Earth’s equator a is 6378.140 km, the pole b is 6356.755 km, an average of half